Chunlei Qiu^*, Yanjun Liu, Xu Chen, Wenqi Dong

School of Materials Science and Engineering, Beihang University, Beijing, 100191, China

EXTENDED ABSTRACT: It is well known that the state-of-the-art titanium alloys are liable for development of columnaigrains and strong texture during additive manufacturing (AM) due to steep thermal gradients in melt pools, lcading tomechanical property anisotropy in as-fabricated parts. In this study, multiple titanium alloys were designed based onconstitutional supercooling solidification theory and d-electron theory with the aim of developing high-strength titaniumalloys special for AM processing and various critical applications, i.e., to achieve both fully equiaxed grain structures and hig!strengths in the AM-processed alloys. Fe and Co have been selected as the main solute elements to titanium and a number of Ti-Fe-Co-Mo samples were fabricated through high-throughput laser additive manufacturing approach (HTAM). Withproper processing conditions, several novel titanium alloys with fully equiaxed grains and ultrahigh yield strength have beensynthesized by HTAM.These alloys with different compositional designs demonstrate different deformation mechanisms(slipping or twinning) but exhibit equally high strengths and good ductility. The microstructural evolution, tensile propertiesand deformation mechanisms of the synthesized alloys have been extensively investigated and will be reported in detail.